The subfields in physics include: Classical Mechanics: Study of motion and forces in macroscopic systems. Quantum Mechanics: Study of the behavior of particles at the atomic and subatomic levels. Thermodynamics: Study of heat, energy, and their relation to work. Electromagnetism: Study of the electromagnetic force and its effects on charged particles. Optics: Study of light and its properties, including reflection, refraction, and diffraction. Astrophysics: Study of the physical properties of celestial objects and phenomena. Particle Physics: Study of the fundamental particles and their interactions. Nuclear Physics: Study of atomic nuclei, nuclear reactions, and radioactivity. Condensed Matter Physics: Study of the physical properties of solid and liquid materials. Biophysics: Study of the application of physics principles to biological systems. Geophysics: Study of the physical properties and processes of the Earth. Cosmology: Study of the origin, evolution, and structure of the universe. Fluid Mechanics: Study of the behavior of fluids, including liquids and gases. Acoustics: Study of sound and its properties. Plasma Physics: Study of ionized gases and their interactions with electromagnetic fields. Atomic and Molecular Physics: Study of the structure and behavior of atoms and molecules. High Energy Physics: Study of particles and interactions at high energies. Mathematical Physics: Study of the mathematical methods used in physics. Computational Physics: Study of the use of computers to solve physics problems. Quantum Field Theory: Study of the application of quantum mechanics to fields and particles. Statistical Mechanics: Study of the behavior of large systems using statistical methods. Relativity: Study of the theory of special and general relativity. Gravitational Physics: Study of the gravitational force and its effects on objects. Atomic, Molecular, and Optical Physics: Study of the interaction of light with atoms and molecules. Experimental Physics: Study of physical phenomena through experimental methods. Theoretical Physics: Study of physical phenomena through mathematical models and theories.